package org.zhiwang.reggie.filter;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import org.zhiwang.reggie.common.BaseContext;
import org.zhiwang.reggie.common.R;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*检查用户是否已经完成登录*/
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {


        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();

        log.info("拦截到的请求:{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[] {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };

        //2.判断本次请求是否需要处理
        boolean check = check(urls,requestURI);

        //3.如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4-1.判断登录状态，如果已登录，则直接放行（管理端）
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为:{}",request.getSession().getAttribute("employee"));

            Long empId = (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断登录状态，如果已登录，则直接放行（移动端）
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为:{}",request.getSession().getAttribute("user"));

            Long empId = (Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5.如果未登录，则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    //路径匹配，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
